Enhanced BaZrO3 mechanosynthesis by the use of metastable ZrO2 precursors
authors Sherafat, Z; Antunes, I; Almeida, C; Frade, JR; Paydar, MH; Mather, GC; Fagg, DP
nationality International
journal DALTON TRANSACTIONS
keywords DOPED BARIUM ZIRCONATE; THERMAL-DECOMPOSITION; STEAM ELECTROLYSIS; MECHANOCHEMICAL SYNTHESIS; MICROSTRUCTURAL CHANGES; PHASE-TRANSFORMATIONS; MECHANICAL ACTIVATION; PROTON CONDUCTIVITY; HYDROGEN-PRODUCTION; CRYSTALLITE SIZE
abstract The current work assesses the impact of structural differences between stable and metastable ZrO2 precursors on the mechanochemical preparation of BaZrO3. Monoclinic (m-ZrO2) and tetragonal (t-ZrO2) zirconia polymorphs were prepared without stabilizing additives by slow alkaline precipitation. High-energy milling of the individual ZrO2 precursors induced different partial transformations in each case. The as-synthesized m-ZrO2 powders showed partial conversion to the tetragonal polymorph on mechanical activation, reaching about 10% t-ZrO2 after 420 min accompanied by increases in strain. In contrast, the as synthesized t-ZrO2 powders underwent the inverse transformation to the monoclinic phase, producing about 50% m-ZrO2 after 120 min with the liberation of strain. The t-ZrO2 precursor was shown to exhibit the higher reactivity with barium peroxide, yielding significantly earlier formation of barium zirconate under room-temperature mechanosynthesis. The progress of the mechanochemical formation of BaZrO3 has been discussed with respect to the differing behaviour of the ZrO2 precursors upon mechanical activation and associated thermodynamic perspectives.
publisher ROYAL SOC CHEMISTRY
issn 1477-9226
year published 2014
volume 43
issue 24
beginning page 9324
ending page 9333
digital object identifier (doi) 10.1039/c4dt00683f
web of science category Chemistry, Inorganic & Nuclear
subject category Chemistry
unique article identifier WOS:000336840900041
link 24819175
  ciceco authors
  impact metrics
journal analysis (jcr 2017):
journal impact factor 4.099
5 year journal impact factor 3.872
category normalized journal impact factor percentile 87.778
dimensions (citation analysis):
altmetrics (social interaction):



 


Apoio

1suponsers_list_ciceco.jpg